I've been doing quite a lot of reading, thinking of building something open baffle.
Many people use Visaton B200 with Alphas. Seems to be a reasonable choice.
For myself, however, I'm thinking it's be better to do an active 3 way...

I'm planning to build a very similar project. Mine will incorporate Alpha 15A's with MarkAudio CHP-70 fullrange drivers (or maybe CHR-70). Crossover to be somewhere in the 300Hz range, depening on what sounds/measures best. However being a baffle-less hanging/swinging system, SPL output will be fairly low.

I'm planning to build a very similar project. Mine will incorporate Alpha 15A's with MarkAudio CHP-70 fullrange drivers (or maybe CHR-70). Crossover to be somewhere in the 300Hz range, depening on what sounds/measures best. However being a baffle-less hanging/swinging system, SPL output will be fairly low.

I've been playing with 4" drivers on OB,
Compared to 8 inches drivers, the less dynamics and smaller soundstage just dont cut it in my fairly large room. I would stay 8" like RA7 suggest. The 3" fostex's beat out the 4" CHR70s in OB.

I've been playing with 4" drivers on OB,
Compared to 8 inches drivers, the less dynamics and smaller soundstage just dont cut it in my fairly large room. I would stay 8" like RA7 suggest. The 3" fostex's beat out the 4" CHR70s in OB.

Surely you have a valid point. I however am far from planning to fill a large room with sound. So for my purposes 4" will do. So far I like the sound of the CHP's, but it's easy to change drivers should I want to. After all there is no baffle to modify

4" may not be enough for the OP, but I thought I'd mention my plans here, as they are rather similar.